powersoft D-Cell 504 - Table of Contents; Important Safety Instructions; Tools

D-Cell 504
Service manual
Table of contents
1 Important safety instructions 3
2 Tools 3
3 Disassembly the power supply 4
4 Disassembly the amplier board 4
5 Assembly outline
D-Cell 504 power supplies 5
6 Assembly outline
D-Cell 504 amplier board 6
7 Checking the power supply 7
8 Failure of the varistor 7
9 Failure of the inductor 8
10 Checkng the output stage 8
11 Failure of the MOSFETs 9
12 Further tests 9
13 Spare part list 10
D-Cell 504 10
1 Important safety instructions
WE RECOMMEND THAT ALL SERVICE OPERATIONS ARE
CARRIED OUT BY A TECHNICIAN IN THE MANNER
DESCRIBED IN THIS GUIDE.
IF NOT EXPLICITLY STATED OTHERWISE, DISCONNECT
THE AMPLIFIER FROM THE MAINS BEFORE OPERATING
THE AMPLIFIER.
WARNING! INTERNAL CAPACITORS BANK COULD BE
CHARGED AND HARMFUL
This technical document is aimed to be a support guide in
solving the most recurrent failures of the D-Cell504 amplier
modules.
The troubleshooting approach will help you characterize the
kind of fault you incur. A recovery method and the related assembly
outline detail is thoroughly explained for the most common faults.
The components to be replaced are clearly shown in red print
to help their identication. At the end of this guide you can nd
a detailed list with the description and the respective Powersoft
internal reference code of the spare parts.
2 Tools
f Phillips PH 0 screwdriver.
f Phillips PH 1 screwdriver.
f Small cutter
f Tweezers
f Function generator or test CD + CD player.
f Double trace oscilloscope (it must be disconnected from the
ground) and probes.
f Multimeter.
f Soldering station.
f Mains insulation transformer/variac.
3
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
!